Biology - Excretory Products and their Elimination Question with Solution | TestHub
If a person performing heavy physical work in summer becomes dehydrated due to excessive sweating and low water intake, which of the following changes will occur to maintain the proper water level in the blood?
Options:
Answer:
Solution:
Excessive sweating and low water intake lead to dehydration, which increases the osmolarity of the blood.
This change is detected by osmoreceptors in the hypothalamus, which stimulate the posterior pituitary gland to release more Antidiuretic Hormone (ADH).
ADH acts on the distal convoluted tubule and the collecting duct of the nephrons, increasing their permeability to water.
This results in increased water reabsorption from the glomerular filtrate back into the blood, helping to restore the normal blood volume and osmolarity.
As a consequence of increased water reabsorption, a smaller volume of highly concentrated urine is formed.
Answer: Increase in ADH secretion Increased water reabsorption in distal tubule & collecting duct Formation of concentrated urine.
